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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c25601e63e7617c5b26b9ab1b87b8975a15bbc89331c93892d1ee575448827e4' 
  AND token = 'vlTL4O0EosflRw/QCmLIhw+I7D4uffIukoZdkitpBBc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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