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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'aa1be94cd18939122a309fd0daf79f3ae4545024992eb01cff2e5539ac763eea' 
  AND token = 'sU+PRTi/vJDWk7ABTW7mTK/l3bRTL1bY3wQF6Oj/36M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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