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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '12ffccda964538857b0df827f7ddacba98c79b1532262374c2db9b8a2428e330' 
  AND token = 'a/AXzFFLky70szdsHdK/0vnhoYTNNU6R1byWSI7riks=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}