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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ff3fc098e453d758c31e2b80e3d6f860fa4e5c4c45c0f8baa4a8075f601ca3fd' 
  AND token = 'b7RAQCxFqf7/dvVWiN9IWOqVBsHHJBi/pEkUZvDB5Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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