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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '020db625284f71657f339ecd1edb66e94f291830a0e36782298369d528f72fd5' 
  AND token = 'AUrW8Wb2y2RVI57IhsMvf4vhuMpQ+pZgJ6Q6/JkEv8c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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