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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ef64fba3f642daa041f0c2814449d817325aadc007261e2cf88aa933b646f9dd' 
  AND token = 'MkAp++lh0mvLHdSpSWgXQzOIc70RlMaucaSoaPBBqcE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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