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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bec7b48a330351e93229ef00b2a21eb9a405c0e7b23eaa138cd33a0e85627f34' 
  AND token = 'Nf9pybscNEXN4DsCPETP/E7CzCZhHTWkTcrz7EqaFHY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00027

JSON explain

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