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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0d510867bf47e0b5cd2410ba254ec884552a1146bc974327bfdaa148d59bfee5' 
  AND token = '5315B9VbJlLlDOUKQkVg/fStUlNzxx9JhgfgyQ881Hk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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