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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd41f87640983b472f2469b3f97f4079f2932b6377af1b0bfa16894bdcfec1b06' 
  AND token = 'aSc2IFI8wx1EySIOwCKMnEviTNzPznsdRseEBRgbKk0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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