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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0dbf8aa5df3e5ab2adce9959c850315b6df75e05a5e72ce5ab692e68ee8c8a43' 
  AND token = 'q9RZUM+YF0Kt1jhhZk0gw5T1FayZBCXOPi441BA4YGY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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