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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4d8c800bad1f72b6946574ac7d665cd5748e2c5fe42521a4d3fe11cfeeaa313d' 
  AND token = '4ViWqiTSMUz3oGw3yLWMasJa73n4O0pd2JOZU4uzkuo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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