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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '939f7247d6f6e401b639d892416ab785cc71c6fd068a03b54430f425c26eaee3' 
  AND token = 'GAkHp6N8RX0Tlatco/3Uc4TEiuYd0ky7HSpHeMV6+aY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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