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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c2d118ee91f4adb0f0bfc449c69fb4d87f0e2640c4b30e670e7ce37a13601746' 
  AND token = 'boySmPCqV4kRFpqsrS2e9oAI4GnIUN59F4h0VR91hrs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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