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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '8c04ec1cac9469ae5d84c506e98e69917d28dcead19ab8c0dc0a9779de608a52' 
  AND token = '81KoCuDR/KALPq6NzwrHHrgDExhjKH6Kw2VmXpryMPY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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