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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e91491f39c364cc156ca686e7fb2ffffe6646bd000e080b98bc1ddd4500e92b0' 
  AND token = 'lqS5ndKMvfijCIAZ4uXPrR0P1aYW4J9cAPWubgEQyUQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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