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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcf5e655a2eba71d5f98edac64cee1b8dc31bf80be6f0074a7128a35330b432c' 
  AND token = 'fjZIQJ0yD1p5GKjn8Sqlf3IUAk7iF4ADkv/JGDyh+3Q=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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