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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '760f93940c54b96214b262242ec975cc375b6ce3aff2ef24527bf349ba5acd3d' 
  AND token = 'BbkHOZeUKLUdl0ynBpzx5iG47lLgQIq5vGP5+P92E2w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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