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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd862ff5a9bacf0b6f5f4e6caeba0a1504972697eea3a505041a88e5d349e043c' 
  AND token = 'Xue3L78szoHe/N76uQFLjamCIMNzS4v4a0CjlcRnxww=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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