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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6d386b081215c3bebac17106a6fb8c74f29b218ba74f8d5811407b78eabb1832' 
  AND token = 'vZH5c1bO5b1aCSA2NXAfZ7r8D3jyshYddF9wOUIsRrQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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