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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '095c4466e233c12edfd47c4ad2a46b04fa0de6fc9b825c158cfb9357a3201afd' 
  AND token = '8nvmgR6UdgdutN8ulpIt1HxB2QMR6fR1UWN/h2jonuw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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