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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4ff40c6b6fbf78c355524df1be35a603bd79209ae7f8232780f9aca910d1cb76' 
  AND token = 'sXWvE+uHUEP7fxzVMACnCeGwTqX4lEci08nWcRs6kTo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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