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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6a81472f0abb6a1ed2bf19a8b5e931c180d11e992baff71ad5bd963a471cda5b' 
  AND token = '68+K5lsWsI+9QaopKJbWzEfd566sXe914qduBgdsfu8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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