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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '56628ad09a9db4f4eed10b1afd574c59b1dd0176e02b68293b2148db5bd67ae8' 
  AND token = '0OUu4uECb+NugZvOzcWzb0K6Q/JsE6ged/K6TIgOZx8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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