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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a6040f8a4816fa86c25bee8a97a95c8d9096759641f0eae236f68d7385b9a0c0' 
  AND token = 'RqQFfcnhO9eCkSYB+tjQyla4S3gdeKtqkHPnvLs/Cn0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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