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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'add9dccc3941b83233dc1336109b53dc7ec02cebc251a3a07c3e6b034a3b8dd0' 
  AND token = 'oNMt6wRECdJpcHfq4G+fZj0B+vudegkaKYy0iMdDmD8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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