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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1b96baf05d0a85c0e94b22f0c689d91bd8b78eb19c6557062c16af5aa14650cb' 
  AND token = 'kaItU4CurzWcGA5/I4Ty/F0NltqQse+LM1GVjZHmzD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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