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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c15b169dee58783918ae7d0c52f3ba48d37212ee1c11423b975bb6640b156bd6' 
  AND token = '9SqOdrQct5PR3UUSi8QyqVHaacNSW3+Y90YJwiJcyo4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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