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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0f176719919a97e060c9389165667d61efd5fb1dc0e9170cf01250d077387de2' 
  AND token = '193o6VP5BQ+Iui90W0945Tzwf8Hx0batdrcupXYyB+w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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