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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c4a65e5c1c9c920a43dfe6b2da2a9417af4e54fd6d9164f3a5d78b52c8c39475' 
  AND token = 'rnd3FEXd375l0a90ENALeHfyfwLO+MRobFNVRnTqMpA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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