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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0fb76b9c558ed5d0468e49799faef8a2b3b2de809d9ba787eaaf36f97d8977b' 
  AND token = 'yrVmoaneQdUuNfmHuYeyvFaa3NOk8/ZQX/V2Go60nlM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

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