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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df1ac8195c2078ed5b9552f4070d7913ab53abe0d67c55f9a7745356d607af08' 
  AND token = 'RfoI0sa8OmKtqy6XNRLN4AJQok6B/br32AzQ08G4B5c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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