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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e993c2a30deab1e4659fa619c15bf24f38994bc457631b9a5f3587e9da6cef93' 
  AND token = 'XkSztYaNTVLNS8Eigg5qGE+uYiQf30pkPoAVv+rM/Zg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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