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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6aef367521d61f4a0f8903dcc2f85ad6bc69ca9d54a708dd400b40d29a1518bc' 
  AND token = 'Fa0uC1GODBHgb1Vg/xEpFakMjTGMsc2WzS21Wz29Los=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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