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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ed5aff184bd4e58baac6c37ee003f282dbb591a3e6b4b255e18d869fcf51e454' 
  AND token = '1UgbKE1IuEtaXs7qJ5roRLa+6+1zg9opoZvPut3qCnI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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