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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f5c2db54634eda3a868cf31d3f127964e43ea93b362e6365105210de6ceffa98' 
  AND token = 'b8els14ycTBy5vC/jVyrMMK5FzZjmtWx+J2sl15GWBs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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