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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cd907bc0227f09ca818d5bfa7ab600d901475d62ca1d3b9731aab6e854c49724' 
  AND token = 'xQWIkzAzgmZ8R9dcYdxHMq7t1wi2k5w4keE5brWA5Vk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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