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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9fbf52ad9cf31826da911ba0d3c00516b794f9ae930c8dcee71c591c31e650c4' 
  AND token = '5MCt8S9lDFUy6I6m5FgA4LhCR35QbCbbIf+y5QsmgCI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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