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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ed6408d633c72bb97ddf511636231949789d8a3f328a69bc0f2ef54599f0a57' 
  AND token = 'IrBBNLbT6BMeS831tbuIM0CXttqStK5pf/vAY8TUQ1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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