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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '5929557bcd28b677bda9a840b380f9c3c16ea8b95d9df65a8d7332c06e08d75a' 
  AND token = 'cn4N4hwPeX14P1+BSjYpB++1gQYcer0Y46msuXJhJ7A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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