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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3a90d9e40275780a73ae4e7c8a92ccb71761048d8105455eb9991bfebf44c88e' 
  AND token = '5TF9gTgVFmP2joQU9F3u8Exi1mtDJ8+OWw35C5IUfgk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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