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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd64912bbd8fab395cbe96d664778742300e0a338a10101af1ceab9b8a1c1cd24' 
  AND token = 'cVKLTgy1hgi2Ssy/5RXptVvW+iFeG7Y7DtNg0zkE5rY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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