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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '170f0d8f6a1f0a53468ef90d981302d27e05fea1a66d03d12561ae17ab485d2e' 
  AND token = 'F0TB8DRfD/PtGoW62g/XeEgvIHC7FnUVOa/DKj73FJc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00023

JSON explain

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