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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '71da0f97cf6a6474e31885866b99823ec975a42a944c4a2ecdbc7f2ceeb00641' 
  AND token = '4hNaobECjuLFhrtpAHdUT/o9kifo8nM37mx+sRJXtpE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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