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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7b709af1f9b5a6e479e3861ea6b662f5cce7ef58e038327be6dd3f9c4cba5a0d' 
  AND token = '5Dib5ypxrEO4phWP0gEANNtRnHz6otfRTOikLY9ugAI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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