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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '993bb3da621ef7498be2813410c4fd59ffd29a09574b48a407fbcd9aeb87c638' 
  AND token = 'bzHQqgSNWa3Y0P5oCQFARKU9qRirnj5gHz9D1hIkFVo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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