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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a1507c0e6f2c0b0a0eb4bcbbe3ea6b9c384eb1b6ee4434225148efcd7fe1dc89' 
  AND token = '1H+wVyawafRnUGO4q/6mMa4VEoWHvWN8ZSiq1EAfTEU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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