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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3092776b6cb6da672c4ec541128c66b2209636190d7539a3539952056c2eb87d' 
  AND token = '5kTFuMd6ccqJNk6Bm5xY5gvwtkt2eLCDyW61RGTcTMY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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