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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33dd398fb64c41b6d19432b3bbb89940ccb2dd0699ebd82928957e662ec1a933' 
  AND token = 'OXL2fgU8mW6AQuLo5tiFGU8IIOLXGyh46YBRULfT0rA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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