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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c07062d1ef6311c142175600b7e38394d91ec4c1a7a8592f4bd248cfc778bd8c' 
  AND token = 'DiRYdRhiHa+79Yeq3ezneROtG8WvwIhj2YZEwUolNXo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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