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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83e97a8f05f600be26c78fdfe6bd67d6a3fae8baf59463314b120200634dbc3' 
  AND token = 'sxR83le46Plks2W2S4KygcB7t6RWkoXOOPHfhm5ATi4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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