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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c7369b690aa52f14700a638bbf7885af88d0380b90b9079090cce415bd775a7e' 
  AND token = 'mRuGoAroQ8g1SUyigRYZq1pRwAYl9JGEVU8brcR3788=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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