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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a63dc1d5b896e9afc193ebb782cf5a40b8b6c6506f70d9fb0d6361b9ccedc369' 
  AND token = 'h7jQAhx0kwSj2Umqw8xRGGwRd4ljVM/sCYbLyuatgtQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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