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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67dba1c8cea833504fd972faaf021221ffdbc0f992ac4f9d369a1132cea87d38' 
  AND token = 'CqJW7dIsolFkCRYN3938HbHU6Km+1zCXyijNZbRNNXE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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