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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c690f7ab7d0b0e1c03ce3dc2bc48a195a73dd87002941fa3eca159f957aaf675' 
  AND token = 'zCLFz06dXwxV9w9zDFYSIEIO/tGr61i7bu3KR9hC5jQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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