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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0571b39b1a34ad7670c1b8dc98454444aa2ad5136dcb31f979dd113320f7739b' 
  AND token = '9eFNiX3E6yW9YlXk3IikKsp+Rcqa8ht5+u6sIIByB2c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00113

JSON explain

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