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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6e7edfc92f587ca8c4cfaf823ffaa181e6650980a804063330b1096435c6d2df' 
  AND token = 'e5XAVhqRea2k7lILHj9bLXoeV0BNJXxreS35SmTuMWM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00065

JSON explain

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