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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '942cd0eb7d31846be19b9c0cd9b93c510f99131136241ea2bb9fae481ee204ff' 
  AND token = 'gtNSSnFnXtvzXWBBE3gujDATrqBZRmbLNZhTtG7Dvxg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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