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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc3cbd913cbb7ee546deca959b656e616d4bf56eaabe020dc32addb13ac2a099' 
  AND token = 'XE5C+DNqwzRduZ+xRGtmewiHK3VFJKEEk2L2rdRdkSU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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