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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '089b9c2b84e50d83cd95d7b84289a79a367bbd3ce901d09eba276ebc4ea60d63' 
  AND token = 'WQGa2+xUs8fGao6DL3C4zp1jXnZ47xYjzmwWoF8z7Cw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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