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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13785d638ad85cc0c3e21211137847bc3fd2b4814509e17b211ca3b3c9248260' 
  AND token = '710NtqnDCDClX6MvLAkd9h8mhBkERogvngPX+kKZm5g=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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